Rapid plant species loss at high rates and at low frequency of N addition in temperate steppe

2014 ◽  
Vol 20 (11) ◽  
pp. 3520-3529 ◽  
Author(s):  
Yunhai Zhang ◽  
Xiaotao Lü ◽  
Forest Isbell ◽  
Carly Stevens ◽  
Xu Han ◽  
...  
Keyword(s):  
Plant Species ◽  
Low Frequency ◽  
Species Loss ◽  
N Addition ◽  
Temperate Steppe

scholarly journals A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe

Ecology ◽  
2016 ◽  
Vol 97 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Qiuying Tian ◽  
Nana Liu ◽  
Wenming Bai ◽  
Linghao Li ◽  
Jiquan Chen ◽  
...  
Keyword(s):  
Nitrogen Deposition ◽  
Plant Species ◽  
Species Loss ◽  
Temperate Steppe

Impacts of urea N addition on soil microbial community in a semi-arid temperate steppe in northern China

2008 ◽  
Vol 311 (1-2) ◽  
pp. 19-28 ◽  
Author(s):  
Naili Zhang ◽  
Shiqiang Wan ◽  
Linghao Li ◽  
Jie Bi ◽  
Mingming Zhao ◽  
...  
Keyword(s):  
Microbial Community ◽  
Soil Microbial Community ◽  
Northern China ◽  
N Addition ◽  
Temperate Steppe ◽  
Soil Microbial ◽  
Semi Arid

Responses of plant 15N natural abundance and isotopic fractionation to N addition reflect the N status of a temperate steppe in China

2018 ◽  
Vol 12 (3) ◽  
pp. 550-563
Author(s):  
Zhilu Sheng ◽  
Yongmei Huang ◽  
Kejian He ◽  
Narigele Borjigin ◽  
Hanyue Yang ◽  
...  
Keyword(s):  
Isotopic Fractionation ◽  
15N Natural Abundance ◽  
Natural Abundance ◽  
N Addition ◽  
Temperate Steppe ◽  
N Status

scholarly journals Nitrogen enrichment enhances the dominance of grasses over forbs in a temperate steppe ecosystem

2011 ◽  
Vol 8 (8) ◽  
pp. 2341-2350 ◽  
Author(s):  
L. Song ◽  
X. Bao ◽  
X. Liu ◽  
Y. Zhang ◽  
P. Christie ◽  
...  
Keyword(s):  
Species Richness ◽  
Aboveground Biomass ◽  
N Deposition ◽  
Soil Mineral N ◽  
N Addition ◽  
Soil Mineral ◽  
Temperate Steppe ◽  
Mineral N ◽  
N Concentration ◽  
Steppe Ecosystem

Abstract. Chinese grasslands are extensive natural ecosystems that comprise 40 % of the total land area of the country and are sensitive to N deposition. A field experiment with six N rates (0, 30, 60, 120, 240, and 480 kg N ha−1 yr−1) was conducted at Duolun, Inner Mongolia, during 2005 and 2010 to identify some effects of N addition on a temperate steppe ecosystem. The dominant plant species in the plots were divided into two categories, grasses and forbs, on the basis of species life forms. Enhanced N deposition, even as little as 30 kg N ha−1 yr−1 above ambient N deposition (16 kg N ha−1 yr−1), led to a decline in species richness. The cover of grasses increased with N addition rate but their species richness showed a weak change across N treatments. Both species richness and cover of forbs declined strongly with increasing N deposition as shown by linear regression analysis (p < 0.05). Increasing N deposition elevated aboveground production of grasses but lowered aboveground biomass of forbs. Plant N concentration, plant δ15N and soil mineral N increased with N addition, showing positive relationships between plant δ15N and N concentration, soil mineral N and/or applied N rate. The cessation of N application in the 480 kg N ha−1 yr−1 treatment in 2009 and 2010 led to a slight recovery of the forb species richness relative to total cover and aboveground biomass, coinciding with reduced plant N concentration and soil mineral N. The results show N deposition-induced changes in soil N transformations and plant N assimilation that are closely related to changes in species composition and biomass accumulation in this temperate steppe ecosystem.

scholarly journals Plant, fungal, bacterial, and nitrogen interactions in the litter layer of a native Patagonian forest

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4754 ◽  
Author(s):  
Lucía Vivanco ◽  
Nicolás Rascovan ◽  
Amy T. Austin
Keyword(s):  
Bacterial Community ◽  
Litter Decomposition ◽  
Plant Species ◽  
Tree Species ◽  
Microbial Interactions ◽  
N Addition ◽  
Litter Layer ◽  
Species Identity ◽  
Single Tree ◽  
Stimulation Of

Plant–microbial interactions in the litter layer represent one of the most relevant interactions for biogeochemical cycling as litter decomposition is a key first step in carbon and nitrogen turnover. However, our understanding of these interactions in the litter layer remains elusive. In an old-growth mixed Nothofagus forest in Patagonia, we studied the effects of single tree species identity and the mixture of three tree species on the fungal and bacterial composition in the litter layer. We also evaluated the effects of nitrogen (N) addition on these plant–microbial interactions. In addition, we compared the magnitude of stimulation of litter decomposition due to home field advantage (HFA, decomposition occurs more rapidly when litter is placed beneath the plant species from which it had been derived than beneath a different plant species) and N addition that we previously demonstrated in this same forest, and used microbial information to interpret these results. Tree species identity had a strong and significant effect on the composition of fungal communities but not on the bacterial community of the litter layer. The microbial composition of the litter layer under the tree species mixture show an averaged contribution of each single tree species. N addition did not erase the plant species footprint on the fungal community, and neither altered the bacterial community. N addition stimulated litter decomposition as much as HFA for certain tree species, but the mechanisms behind N and HFA stimulation may have differed. Our results suggest that stimulation of decomposition from N addition might have occurred due to increased microbial activity without large changes in microbial community composition, while HFA may have resulted principally from plant species’ effects on the litter fungal community. Together, our results suggest that plant–microbial interactions can be an unconsidered driver of litter decomposition in temperate forests.

scholarly journals Testing mechanisms of N-enrichment-induced species loss in a semiarid Inner Mongolia grassland: critical thresholds and implications for long-term ecosystem responses

2012 ◽  
Vol 367 (1606) ◽  
pp. 3125-3134 ◽  
Author(s):  
Zhichun Lan ◽  
Yongfei Bai
Keyword(s):  
Ecosystem Services ◽  
Rare Species ◽  
Inner Mongolia ◽  
Global Environmental Change ◽  
N Deposition ◽  
Critical Threshold ◽  
Species Loss ◽  
N Addition ◽  
Precipitation Regimes ◽  
N Enrichment

The increase in nutrient availability as a consequence of elevated nitrogen (N) deposition is an important component of global environmental change. This is likely to substantially affect the functioning and provisioning of ecosystem services by drylands, where water and N are often limited. We tested mechanisms of chronic N-enrichment-induced plant species loss in a 10-year field experiment with six levels of N addition rate. Our findings on a semi-arid grassland in Inner Mongolia demonstrated that: (i) species richness (SR) declined by 16 per cent even at low levels of additional N (1.75 g N m –2 yr −1 ), and 50–70% species were excluded from plots which received high N input (10.5–28 g N m −2 yr −1 ); (ii) the responses of SR and above-ground biomass (AGB) to N were greater in wet years than dry years; (iii) N addition increased the inter-annual variations in AGB, reduced the drought resistance of production and hence diminished ecosystem stability; (iv) the critical threshold for chronic N-enrichment-induced reduction in SR differed between common and rare species, and increased over the time of the experiment owing to the loss of the more sensitive species. These results clearly indicate that both abundance and functional trait-based mechanisms operate simultaneously on N-induced species loss. The low initial abundance and low above-ground competitive ability may be attributable to the loss of rare species. However, shift from below-ground competition to above-ground competition and recruitment limitation are likely to be the key mechanisms for the loss of abundant species, with soil acidification being less important. Our results have important implications for understanding the impacts of N deposition and global climatic change (e.g. change in precipitation regimes) on biodiversity and ecosystem services of the Inner Mongolian grassland and beyond.

Plant species effects on soil carbon and nitrogen dynamics in a temperate steppe of northern China

2011 ◽  
Vol 346 (1-2) ◽  
pp. 331-347 ◽  
Author(s):  
Lili Jiang ◽  
Xingguo Han ◽  
Ning Dong ◽  
Yanfen Wang ◽  
Paul Kardol
Keyword(s):  
Soil Carbon ◽  
Plant Species ◽  
Northern China ◽  
Nitrogen Dynamics ◽  
Temperate Steppe ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen ◽  
Species Effects ◽  
Carbon And Nitrogen Dynamics

scholarly journals Effect of plant species loss on aphid-parasitoid communities

2010 ◽  
Vol 79 (3) ◽  
pp. 709-720 ◽  
Author(s):  
Jana S. Petermann ◽  
Christine B. Müller ◽  
Alexandra Weigelt ◽  
Wolfgang W. Weisser ◽  
Bernhard Schmid
Keyword(s):  
Plant Species ◽  
Species Loss ◽  
Aphid Parasitoid

scholarly journals FLORISTIC CHANGE IN NEW ENGLAND AND NEW YORK: REGIONAL PATTERNS OF PLANT SPECIES LOSS AND DECLINE

Rhodora ◽  
10.3119/18-04 ◽  
2019 ◽  
Vol 121 (985) ◽  
pp. 1 ◽  
Author(s):  
Caitlin McDonough MacKenzie ◽  
Glen Mittelhauser ◽  
Abraham J. Miller-Rushing ◽  
Richard B. Primack
Keyword(s):  
New York ◽  
New England ◽  
Plant Species ◽  
Species Loss ◽  
Regional Patterns ◽  
Floristic Change

scholarly journals Species Differences in Nitrogen Acquisition in Humid Subtropical Forest Inferred From 15N Natural Abundance and Its Response to Tracer Addition

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 991 ◽  
Author(s):  
Geshere Abdisa Gurmesa ◽  
Xiankai Lu ◽  
Per Gundersen ◽  
Qinggong Mao ◽  
Yunting Fang ◽  
...  
Keyword(s):  
Plant Species ◽  
N Uptake ◽  
N Deposition ◽  
Subtropical Forest ◽  
Species Variation ◽  
N Addition ◽  
Subtropical Forests ◽  
The Impact ◽  
N Acquisition ◽  
Leaf N

Differences in nitrogen (N) acquisition patterns between plant species are often reflected in the natural 15N isotope ratios (δ15N) of the plant tissues, however, such differences are poorly understood for co-occurring plants in tropical and subtropical forests. To evaluate species variation in N acquisition traits, we measured leaf N concentration (%N) and δ15N in tree and understory plant species under ambient N deposition (control) and after a decade of N addition at 50 kg N ha−1 yr−1 (N-plots) in an old-growth subtropical forest in southern China. We also measured changes in leaf δ15N after one-year of 15N addition in both the control and N-plots. The results show consistent significant species variation in leaf %N in both control and N-plots, but decadal N addition did not significantly affect leaf %N. Leaf δ15N values were also significantly different among the plant species both in tree and understory layers, and both in control and N-plots, suggesting differences in N acquisition strategies such as variation in N sources and dominant forms of N uptake and dependence on mycorrhizal associations among the co-occurring plant species. Significant differences between the plant species (in both control and N-plots) in changes in leaf δ15N after 15N addition were observed only in the understory plants, indicating difference in access (or use) of deposited N among the plants. Decadal N addition had species-dependent effects on leaf δ15N, suggesting the N acquisition patterns of these plant species are differently affected by N deposition. These results suggest that co-occurring plants in N-rich and subtropical forests vary in their N acquisition traits; these differences need to be accounted for when evaluating the impact of N deposition on N cycling in these ecosystems.

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